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I used to use Hydrocal Grade-B. Not so cheap and comes in 78 lb. sacks.
Also there is Plastic Cement, which comes in 35 lb. sacks.
Regardless which kind of plaster/cement you use all tips remain the same. just allow for the various drying times for each that you use.
Preparations. What you need: Cardboard, Wood, used window screens, scissors, tape, nails hammer.etc.
I would mix a few cups of cement and when just right [paper towels soaked with the mixture do not fall apart in your hands]
take the soaked paper towels and lay them on the cutouts.
The kind of poster paint which is a powder, mix in flour sifter (buy your own) until mixed almost throughly. You do not want the color to be consistant.
Spray water on cement that is still slightly wet, sift colored cement powder over wet cemenmt, sparingly.
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@ Trainweb.
